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Chapter 3: Experimental design - Setting up a fair trial


Terms and definitions

Have a look at the following terms and see if you know what they mean.

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Experiment

Definition:
A series of processes that are carried out to support or disprove a hypothesis.

Test

Definition:
A component of an experiment that defines the hypothesis, materials, procedures and collection methods.

Trial

Definition:
The number of times you carry out a test.

Hypothesis Definition:

The educated guess you make at the beginning of a trial and try to answer, by asking the following questions:
What do you already know?
What do you think the answer is?
What do you think will happen and why?

Data Definition:
The record of what occurs throughout the test.
Constants Definition:
The elements that you keep the same throughout the test.
Independent variables Definition:
The elements that you change throughout the test.
Dependent variables Definition:
The elements that change because you change the independent variables.
Procedure Definition:
The steps you follow to carry out the test and conduct the experiment.

Materials
Definition:
The list of resources you need to do the test.
Results Definition:
The outcome of carrying out the procedure. Results must be collected and written down on some type of data collection form.
Conclusion Definition:

The final statement that reviews the experiment by:

  • Showing or proving the results of the test.
  • Deciding whether the hypothesis was correct or incorrect.
  • Analysing whether the test was valid, i.e. if the test was repeated would the same conclusions be reached?
  • Looking at how the test can be improved, i.e. what would you do differently next time?

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